Threaded cap



' Nov. 23 1926. 1,607,825

C. HAMMER THREADED CAP Filed Oct. 5 1925 Patented Nov. 23, 1926.

UNITED STATES PATENT OFFICE.

CHARLES HAMMER, or HoLLrs 00cm eonrnvnnnnnw YORK, ASSIGNOR 'ro AMERI-oAn METAL car COMPANY, or BROOKLYN, NEW YORK, A oonrona'rron 01? NEWYORK.

' THREADED oer.

This invention relates to metal caps, particularly to that style knownas threaded caps, either of thedivided or the continuous .threadvariety, the object of the invention being to provide an improved threadcap simple in construction, easily and inexpensively manufactured, andmore sanitary in use.

In the manufacture of a large number of threaded caps from sheet metal,it is the practice to entirely fill one side of the metal sheet with aspecified number of printed or coated caps in certain colors togetherwith the desired trade marks or ad vertising symbols, and then pressfrom this sheet the caps having a top and a skirt provided with astrengthened or beaded lower edge formed by turning the lower edgeoutwardly and upwardly and the skirt is pro vided with suitable lockingthreads, The

result is that the top offthe cap and that portion of the skirt down tothe curled edge is of one color as for instance white while the beadededge'has a brass appearance corresponding to that on the inside of thecap. 'This is not. only unsightly but is also unsanitary in that theoutwardly upturned lower edge forms a joint for the reception ofmoisture and also has a tendency to crack or chip the enamel or coatingon the skirt during the formation of this strengthened edge. v

The object of the present improvement therefore is to provide a capwhich will have its lower edge so formed as to'prevent the cracking ofthe coating of the skirt during the formation of such edge and preventthe formation of any crack or seam on the outside of the skirt therebyproviding not only a more sanitary but a more pleasing form of cap.

In the drawings accompanying and forming a part of this specification,Fig. 1 is a side view of this improved cap and Fig 2 is a bottom viewthereof and Fig. 3 is a cross sectional view of the can.

Similar characters of reference indicate corresponding parts in theseveral views.

Before explaining in detail the present improvement and mode ofoperation thereof, I desire to have it understood that the invention isnot limited to the details of const'ruction and arrangement of partswhich are illustrated in the accompanying drawings, since the inventionis capable of other embodiments, and that the phraseology which I employis for-the purpose of description and not of limitation.

This improved cap comprises a coated or enameled top 2 provided with acoated or enameled depending flange or skirt 3 usually provided withsuitable reinforcing knurls or corrugations 4 and cap retainingprojections shown in the form of threads 5. These threads may either beof the divided form or of the continuous form. In

the form-shown the thread extends practically around the cap, it beingnarrow and shallow at its entering end and wide and deep as itapproaches its opposite end whereby for a considerable distance aroundthe cap the lower'under edge of the-thread is substantially parallelwith the lower edge of the cap while the thread is inclined along itstop to engage a suitable thread or retaining projection on thecontainer. The lower edge of the cap is provided with a strengthened orreinforced edge 6 usually obtained by curling or. beading the edge, butin this improved form of cap this edge is bent inwardly and upwardly onthe inside of the cap, forming a very small but evenreinforced edge sothat the entire skirt has a similar appearance or color in that if it iswhite, blueor other color,- the entire skirt has this same color and isnot broken as heretofore by having a portion of it white.

and a portion of it brass colored. The bending of the lower edgeinwardly upon itself prevents the breaking or 'chipping of the enamel onthe skirt by the contact of the outwardly bent edge in the press duringthe-formation of the skirt.

It will be observed that the inwardly and I without attempting to set,forth all of the forms in which it may be made, or all of the modesofits use, I.claim': I

1. A rotatable threaded metal cap comprising an exteriorly coated orenameled top and skirt having a locking projection or thread therein,the lower edge thereof being bent inwardly and upwardly to form a curlededge of such size that it is free of contact with the container wherebythe coated skirt has the same appearance throughout every part of theexterior thereof.

2. A-rotatablethreaded metal cap com- "prising an exteriorly coatedorenameled topandskirt, said skirt having a locking thread-0f non-uniformcross section, the lower edge of the coated skirt being bent inwardlyand upwardly ;to form a curled,

' beaded-or strengthened lower edge of such size that it is free ofcontact with the container and having the same coated appearance as therest of the exterior of the skirt.

3. A rotatable threaded metal cap comprising an exteriorly coated orenameled top and skirt, said skirt having a single continuous lockingthread extending substantially around the skirt, the lower edge of thecoated skirt being inwardly and upwardly bent to form a curled, beadedor strengthened lower edge of such size that it is free of contact withthe container and having the samecoated appearance as the rest of theexterior of the skirt.

4. A rotatable threaded metal cap comprising an exteriorly coated orenameled top and skirt, said skirt having a single continuous lockingthread of non-uniform cross-section extending substantially around theskirt, the lower edge of the coated skirt being inwardly and upwardlybent to form a curled, beaded o'r strengthened lower edge of such sizethat it is free of contact with the container and having the same coatedappearance as the rest of the exterior of the 5 art.

5. A rotatable threaded metal .cap comprising an exteriorly coated orenamaled top and shallow skirt, said skirt having a locking thread ofnon-uniform cross section and having between the thread and the topthereof a series of corrugations, the lower 1 edge of the coated skirtbeing bent inwardly and upwardly to form a curled, beaded orstrengthened lower edge of such size that it is free of contact with thecontainer and having the same coated appearance as the restof theexterior of the skirt.

Signed'at Brooklyn, New York, this 2nd day of October 1925.

CHARLES HAMMER.

